I'm sure you're familiar with abstinence and rhythm, which are the only methods accepted by the Catholic church. Another method is the use of contraceptive pills, which you can start using the month before your husband comes home. There are many widely available brands. You can also use "barrier methods" such as the condom and the diaphragm. They are very effective when used properly. Consider also methods that require minor surgical procedures such as intrauterine device (IUD) insertion, bilateral tubal ligation for you, and vasectomy for your husband. The latter two will require signed agreements from both spouses.

Discuss these and other options with your obstetrician-gynecologist, who knows your pregnancy and birth history, and who is best equipped to advise you on the best method for your purposes.